absurd
(absurdo): more absurd
than
the most absurd NO ES
CORRECTO DECIR:
absurder than
the absurdest

modern
(moderno): more
modern than
the most modern polite (educado):
more polite than
the most polite serious (serio):
more serious than
the most serious tired (cansado):
more tired than
the most tired

This book is the most expensive
.(Este libro es el más caro)This house is
the most comfortable .(Esta casa es la más cómoda)These books are
the most expensive .(Estos libros son los más caros)These houses are
the most comfortable .(Estas casas son las más cómodas)